updating database

hi all,

i am updating data base from xl file.

in xl file i have 5 fileds.

but 3 fileds have the field values i uploded that file and update ddatabase.

it uploded fine.

but now in xl file i got 2 other filed values i want to update that 2 values.

i used update dbtable.

but i am not getting correct

tell me the syntax for update.